Wildfire smoke has been fouling U.S. air quality for several days, starting in states bordering Canada, including the Dakotas, Minnesota and other Midwestern states.

Massive wildfires burning out of control in western and central Canada are forcing thousands to flee. The blazes are also sending hazardous smoke toward major cities in the United States.

Smoke from Canada’s wildfires has drifted south across the U.S. border. This month, a group of six Republican lawmakers wrote to Canada’s ambassador to the United States, ...

Smoke from raging Canadian wildfires is once again worsening air quality in some U.S. states.. Parts of the Dakotas, Minnesota, Wisconsin, Illinois, Indiana, Ohio and other states were all ...

But the smoke is drifting across much of the rest of the country. Smoke from California wildfires obscures the view of Strip casinos in Las Vegas on Aug. 7, 2021. Steve Marcus/Las Vegas Sun via AP.

Smoke from Canadian wildfires has entered the Southeast. The satellite Monday morning picked up the smoke entering central Mississippi, and the skycams across the area showed it in a milky, subdued ...

That smoke area had doubled in size by Sunday, covering more than 1.2 million square miles in Canada. Heavy smoke also overspread about 750,000 square miles of the US on Sunday. That’s a huge ...

Maps show where new plumes of smoke will cause hazy skies through the end of the week. Low-level smoke is forecast to spread eastward Wednesday across the Appalachians and into the Mid-Atlantic ...

Smoke from Canadian wildfires is headed toward Massachusetts, and prompting concerns about air quality in Boston. There are numerous wildfires raging in northwestern Canada and also over parts of ...

Some of those blazes also sent thick, hazardous smoke into US cities. This year, wildfires have burned more than 1.58 million acres in Canada, about 40% above the 10-year average for this point in ...